Test: EnvironmentVariableCollection options

[Tyriar]

Refs: #179476

• macOS @meganrogge
• linux @jrieken
• windows @bamurtaugh

Complexity: 3

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To test, create a basic extension that uses the follow APIs and make sure they work without proposed API access:

	export interface EnvironmentVariableMutatorOptions {
		applyAtProcessCreation?: boolean;
		applyAtShellIntegration?: boolean;
	}
	export interface EnvironmentVariableCollection extends Iterable<[variable: string, mutator: EnvironmentVariableMutator]> {
		replace(variable: string, value: string, options?: EnvironmentVariableMutatorOptions): void;
		append(variable: string, value: string, options?: EnvironmentVariableMutatorOptions): void;
		prepend(variable: string, value: string, options?: EnvironmentVariableMutatorOptions): void;
	}

[bamurtaugh]

Sorry, I broke the TPI temporarily by adding a 🏃 to indicate I was working on it. Removed the runner (though I'm still working on this TPI!).